4. A commercial bank has provided the balance sheet below. It has no off-balance sheet activities. Corporate bonds have a 100% loan-to-value risk weight and residential mortgages have a 50% loan- to-value risk weight. Assets ($ millions) Liabilities and Equity ($ millions) Cash $ 85 Deposits $ 1,465 U.S. Treasury securities 153 Subordinated debentures 32 Corporate bonds 459 Common stock 34 Residential mortgages 865 Retained earnings 31 Total Assets $ 1,562 Total Liabilities and Equity $ 1,562 a. Calculate each of the following ratios. For each ratio, also explain which capital category zone the bank falls into. (4 points each) i. CET1 risk-based capital ratio ii. Tier I risk-based capital ratio iii. Total risk-based capital ratio iv. Tier I leverage ratio b. Given your calculations and the capital categories in a., what prompt corrective actions will be required of the bank by its regulators? Explain. (4 points)